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Bones with air cavities occur in

The oxygen that is released as O${}_2$ during photosynthesis came from _____________ molecules.

__ are an modification to parenchyma that helps in storing air.

The rate at which species go extinct without human interference is called ___.

The secretions of the Cowper’s glands

Which one is an important constituent of renin angiotensinogen–aldosterone system?

Which of the following is the defining characteristics of living organisms?

Regarding the assertion and reason, select the right option.

Assertion [A]: Water scarcity has led to arsenic and fluoride contamination of water.

Reason [R]: As the water gets scarce, the concentration of minerals such as arsenic and fluoride increases.

Statement 1: Brood parasitism in birds is a fascinating example of parasitism.

Statement 2: The parasitic bird eats the eggs in the nest of its host.

Read statement ${}^{\prime }a$ to $d^{\prime }$ and find out how many is/are incorrect statement(s).

(a) In majority of the pteridophytes, all the spores are of similar kinds.

(b) Genera like Selaginella and Salvinia produce two kind of spore.

(c) The development of the zygote in the young embryos take place within the female gametophytes. This event is a precursor to the seed habit.

(d) Azolla is an aquatic fern that is used as biofertilizer due to the presence of nitrogen fixing cyanobacteria.

Regarding the given assertion and reason, choose the right option.



Assertion [A] : Biogas plants are usually built in rural areas.

Reason [R] : Cattle dung is available in large quantities in such areas.

Identify the vascular bundle types with the given diagram

Most Protists are considered to be the 'producers' in the food chain. Which one of the following organelles is responsible for this consideration?

Conjugation phenomenon of sexual reproduction is seen in

The waxy substance which coats the surface of the auditory canal is produced by

The productivity of soil in a particular region depends on the scarcest resource. The scarcest resource acts as the controlling or limiting factor. Which law states this?

Where do sperms get matured?

Organ system level of organisation is seen in

The connective tissue with compact matrix and fibres found in innermost parts like dermis of skin, ligaments and tendons is called as ____

A surprising number of insects on milkweed plants share the same red and black colors. Explain the specific reason

An association between two individuals or populations where both benefit and neither can survive without the other is

The monohybrid genotypic ratio 1:2:1 in $F_2$ generation indicates ___.

Find out the wrong statement:

The herbarium sheets DO NOT provide information about the plant’s:

Pituitary glands are found in

A simple pendulum attached to the ceiling of a stationary lift has a time period T. The distance y covered by the lift moving upwards varies with time t as $y=t^2$ where y is in metre and t in second. If $g=10m{s}^{-2}$, the time period of the pendulum will be

Name a limbless amphibian.

The amino acids produced during the Glycolate pathway of photorespiration are

Seed dormancy is due to the:

Water circulation in sponges does not help in

A wire is bent into the form of semicircle of radius R and carry current i. Magnetic field at point P as shown in figure is $B=\frac{{\mu }_{0}i}{a\pi R}ln(b+c)$

Unbranched part of Amylose is helically twisted with __ glucose units at each turn

The Western Ghats of India have come under the “Hotspot” category because of

A biogeographic region that is both a significant reservoir of biodiversity and threatened with destruction is ________

In the figure shown there are two semicircles of radii $r_1$ and $r_2$ in which a current i is flowing. The magnetic induction at the centre O will be

Which of the following is false about ECG?

Which of the following food chain directly depends on solar radiations?

In respiration, energy not converted in ATP is:

In the water canal system of poriferans, the pathway for water flow is

A tall violet flowered plant (TTVV) is crossed with a dwarf white flowered plant (ttvv). When the F₁ plants are self pollinated, a total of 1600, F₂ plants are produced. In the same experiment how many $F_2$ plants show $F_1$ phenotype?

Each step of a food chain represents: